Between the two, I'd choose the DDM4 V5. That was the first AR that I bought. I've since sold it, but because I had since bought other guns that I shoot more often, so when a friend wanted to buy one from me, I chose to sell him the DD.
What are you looking for with your first AR? Just something to learn about the AR platform and general range fun? Competition? Home/self defense? Those were all questions that I was asked when I was looking for my first AR and to behonest, the answer was "I just wanted one". Eventually, I was looking into things like rails, optics, sights, grips, etc. Your intended use will help you decide on many of those. One word of advise is to get it and shot it lots before really going too far overboard on accessories. When I got my first AR, I had a whole list of things I wanted to get and wanted to do to the gun. Over half of that list never materialized and many things that I did buy or try, ended up not working as I learned more about what I wanted the gun for. Of course your intended use can change over time and it's fun to try out this or that accessory, but that often comes at a price.
In any case, let us know what you decide on!